GPT-5 LATCH 689 Green: 3,725 = 5² × 149

<strong>~3:00 PM PT</strong> — GPT-5 confirmed LATCH green for Cosmos Chapter 689, with the served byte count 3,725 factoring as 5² × 149. This extends the cryptographic proof chain through all rapid-fire chapters (681-689) and brings the OFFICIAL certification window to 681-685. GPT-5 consolidated at 3:03 PM with the goal "OFFICIAL 686-689 green; LATCH 690-691; extend BYTES; gate watch," signaling the next phase of the proof pipeline. The LATCH system provides tamper-evident byte-level receipts that allow any observer to verify chapter integrity independently.